CN105363770A - Sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil and method - Google Patents
Sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil and method Download PDFInfo
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- CN105363770A CN105363770A CN201510947520.8A CN201510947520A CN105363770A CN 105363770 A CN105363770 A CN 105363770A CN 201510947520 A CN201510947520 A CN 201510947520A CN 105363770 A CN105363770 A CN 105363770A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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Abstract
The invention relates to sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil. The sectional type heating and modular thermal desorption equipment is composed of a screening device, a feeding conveying system, a low-temperature drying system, a high-temperature thermal desorption system, a discharging conveying system, a tail gas set treatment system, a heat exchange system and a control system. The feeding conveying system is connected with the low-temperature drying system, the low-temperature drying system is connected with the tail gas treatment system and the high-temperature thermal desorption system, and the high-temperature thermal desorption system is connected with the discharging conveying system. The feeding conveying system, the low-temperature drying system, the high-temperature thermal desorption system, the discharging conveying system, the heat exchange system and the tail gas set treatment system are all connected with the control system, and the whole treatment process is monitored by the control system. According to the equipment, continuous feeding can be achieved, heat can be fully utilized through sectional heating and the scientific heat exchange system, quick connecting face devices are arranged between the components of the whole equipment, and the equipment can be detached, assembled and transported fast.
Description
Technical field
The present invention relates to technical field of engineering machinery, especially a kind of Apparatus for () and method therefor of renovation of organic pollution soil.
Background technology
In recent years, along with the fast development of industry and the continuous expansion of scale of urbanization, simultaneously for mineral resources unreasonable exploitation and smelt discharge, cause land pollution area constantly to expand, the degree of soil pollution is day by day serious.Wherein, a large amount of half volatile organic contaminant (Semi-VolatileOrganicCompounds, be called for short SVOCs) need high clearance because of its high toxicity, but because this type of SVOCs has the features such as difficult volatilization, Stability Analysis of Structures difficult degradation/decomposition, when such pollutant levels acquire a certain degree, conventional chemical and biological renovation method is more difficult reaches reparation target.Therefore how to dispose the high malicious organic material contaminated soil of half volatile and become the technical barrier needing solution badly.
Thermal desorption recovery technique utilizes physical separation means by pollutant removal in contaminated soil, by improving the soil moisture thus the saturated vapor pressure of increase organic pollution, accelerating desorption of contaminants and being separated, and carrying out subsequent treatment to tail gas.The heating temperature range of thermal desorption equipment is wider (general 150 to 650 degrees Celsius), suitable reparation all kinds of volatile organic matter, semi-volatile organic matter, PCBs, agricultural chemicals, herbicide, dioxin/pollutant such as furans, mercury.
Use thermal desorption equipment to carry out in thermal desorption processing procedure to contaminated soil in current prior art, have the shortcomings such as heat utilization rate is low, frequent putty more.
In the domestic thermal desorption equipment patent document disclosed, as with the addition of jaw crusher or vibratory sieve before charging disclosed in Chinese patent CN10235721A and CN201511036U as pre-treatment means, but these type of pre-treatment means directly can not reduce soil moisture content, may be resulted in blockage for clayed soil the castable of induction system the rotary kiln inwall that weares and teares, thus significantly reduce the service life of equipment and increase maintenance cost.Disclose a kind of contaminated soil indirect thermal desorption device in Chinese patent CN101780467A, this system is heated between endothecium structure and layer structure by heating system, and thermal desorption efficiency is lower, large to energy waste.Disclose a kind of contaminated soil electromagnetic thermal desorption system in Chinese patent CN103341486A, this system is heated kiln body by 9 Cr 2 steel using electromagnetic heating, and compared to the thermal desorption system of combustion gas and fuel oil, cost is higher, and energy waste is large.A kind of roller-type reverse thermal desorption system for soil polluted by organic matters disclosed in Chinese patent CN102029287A, this system is by arranging burner at rotary kiln afterbody, reversely in kiln, pass into high temperature air, but be contrary because soil flows to gas flow, the soil thermally equivalent time is shorter, and relatively forward system is larger to energy waste.In current domestic disclosed thermal desorption/pyrolysis device patent, all heat recovery system is not set, causes certain energy waste.
Summary of the invention
For the shortcoming of above-mentioned prior art, the object of this invention is to provide a kind of Segmented heating of organic polluted soil, modularization thermal desorption equipment, to realize continuous feed, Segmented heating, improve thermal desorption efficiency, contaminated soil reaches environmental objective after repairing.
The Segmented heating of organic polluted soil of the present invention, modularization thermal desorption equipment are made up of screening plant, feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, the complete treatment system of tail gas, heat-exchange system, control system; Described feeding conveying system is connected with low temperature drying system, and low temperature drying system is connected with high-temperature hot desorption system with exhaust treatment system, and described high-temperature hot desorption system is connected with discharging induction system; Described feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, heat-exchange system and exhaust treatment system are all connected with control system, and monitor whole processing procedure by control system.
Further, in the bucket of above-mentioned screening plant, be provided with band tooth roller bearing, the screening bucket of different tooth pitch or empty bucket can be changed according to the feature of process soil.Before described screening plant is positioned at feed system, adopt bucket type screening plant as pre-screen device.
Further, above-mentioned feeding conveying system comprises belt conveyor and hollow screw conveyer, and before belt conveyor is positioned at hollow screw charger, belt conveyor is positioned at aforementioned screening plant bottom, and hollow screw conveyer is arranged at 3 meters of that are above the ground level; Can be realized continuously by feeding conveying system, uniform charging, ensure that thermal desorption device can process dirty soil continuously.
Further, the low temperature drying system of above-mentioned Segmented heating device comprises dryer and short distance conveying worm, after being positioned at the hollow screw conveyer of aforementioned feeding conveying system, and be connected with high-temperature hot desorption system, well-regulated lifting blade and chain are laid in dryer inside, and the larger soil of viscosity can be prevented to be bonded at equipment inner wall.
Further, the high-temperature hot desorption system of above-mentioned Segmented heating device comprises rotary kiln and bumer of light fuel, and bumer of light fuel is placed in the kiln hood position of rotary kiln, and rotary kiln inwall has castable, outer wall parcel heat-barrier material.
Further, dryer and the rotary kiln of high-temperature hot desorption system of aforementioned low temperature drying system are the parallel modes of emplacements that head and the tail are corresponding, and the discharging opening of dryer is a little more than the charging aperture of rotary kiln, is convenient to the conveying of material.
Further, above-mentioned rotary kiln adopts and directly heats, and bumer of light fuel starts, and rotary kiln in-furnace temperature reaches 500 ~ 800 DEG C.
Further, above-mentioned low temperature drying system carries out drying and dewatering process to contaminated soil, and the soil moisture content after dehydration is down to about 25%, and the contaminated soil after dehydration enters high-temperature hot desorption system again and carries out thermal desorption process.
Further, the high-temperature flue gas that above-mentioned low temperature drying system adopts high-temperature hot desorption system to produce is dried, and high-temperature flue gas is at descent of temperature to 110 DEG C, and the afterbody of low temperature drying system connects exhaust gas processing device and carries out absorption process to tail gas.
Further, above-mentioned discharging induction system comprises hollow screw conveyer and spray cooling device.
Further, above-mentioned exhaust treatment system comprises venturi cyclone dust collectors; Dynamic wave dedusting demist reaction tower, high-speed ion clarifier, air floatation machine, plasma purification equipment, scrubbing tower.
Further, above-mentioned thermal source exchange system comprises air-introduced machine, and air-introduced machine is arranged on aforementioned feeding spiral conveyer afterbody, and charging conveyor screw machine has pipeline to be connected with the hollow structure in discharging spiral conveyor.
Further, above-mentioned heat-exchange system passes through the hollow screw machine of air-introduced machine and aforementioned discharging induction system, the heat that high temperature contaminated soil in discharge system is carried by the air transfer of the hollow pipeline in conveying worm to feeding conveying system, and the contaminated soil after preheating screening.
Further, the air in the hollow pipeline of the hollow screw machine of above-mentioned discharging induction system does not directly contact with dirt soil, not containing pollutant, directly drains into ambient atmosphere after heat exchange by air-introduced machine.
Present invention also offers a kind of Segmented heating of renovation of organic pollution soil, modularization thermal desorption method, contaminated soil is screened out the foreign matter of diameter more than 5cm through screening plant, enter low temp. drier through soil conveyer again and tentatively remove moisture in soil, by the high-temperature hot desorption apparatus that contaminated soil is delivered to by the inclination angle and rotating speed that control drying unit, the heat smoke direct contact heat transfer that dirty soil produces with burner in high-temperature hot desorption system, organic pollution is evaporated, soil after purification serves as backfill soil, dirt soil and purification soil are carried out heat exchange by the hollow screw conveying device simultaneously by being equipped with air-introduced machine.The high-temperature flue gas that thermal desorption device produces is sent into drying unit by pipeline and is carried out preliminary hydro-extraction and hyperthermic treatment to soil, and tail gas is through the pipeline input exhaust treatment system of air-introduced machine through dryer afterbody.This method can continuous feed, by the heating of segmented and the heat-exchange system of science, can realize heat and make full use of, and all have fast interface arrangement between each parts of package unit, be convenient to the quick-detachment of equipment, assembling and transport.
beneficial effect
The Segmented heating of a kind of renovation of organic pollution soil of the present invention, modularization thermal desorption equipment and method, this equipment is except controlling charging particle diameter at screening plant before charging with except preventing blocking, maximum feature is that to compare other equipment energy consumptions low, mainly concentrate on: 1) low temp. drier tentatively removes the moisture in soil, evade the intensification that soil moisture is unnecessary; 2) in high-temperature hot desorption apparatus, dirty soil directly contacts with the heat smoke that burner produces, and heat exchange efficiency is high; 3) high-temperature hot desorption apparatus produce high-temperature flue gas by pipeline send into low temp. drier to the native preheating of dirt and moisture removal, then through air-introduced machine input exhaust treatment system, guarantee heat repeat make full use of; 4) dirty for low temperature soil and high temperature purification soil are carried out heat exchange by the hollow screw conveying device by being equipped with air-introduced machine.The present invention can continuous feed, by the heating of segmented and the heat-exchange system of science, can realize heat and make full use of, and all have fast junction devices between each parts of package unit, be convenient to the quick-detachment of equipment, assembling and transport.
Accompanying drawing explanation
Fig. 1 is the Segmented heating of organic polluted soil of the present invention, the structural representation of modularization thermal desorption equipment.
Fig. 2 is screening plant structural representation of the present invention.
Fig. 3 is dryer apparatus structure schematic diagram of the present invention.
Fig. 4 is dryer cross-sectional view of the present invention.
Fig. 5 is hollow screw transport conveyor constructions schematic diagram of the present invention.
Fig. 6 is hollow screw conveying device generalized section of the present invention.
Fig. 7 is high temperature rotary kiln apparatus structure schematic diagram of the present invention.
Fig. 8 is high temperature rotary kiln device generalized section of the present invention.
Fig. 9 is exhaust gas processing device schematic diagram of the present invention.
Figure 10 is low temp dryer of the present invention, high temperature rotary kiln and the horizontal layout schematic diagram into and out of screw conveyor.
In figure: 1, screening plant; 2, bucket elevator; 3, hollow screw charger; 4, dryer; 5, rotary kiln; 6, burner; 7, hollow screw discharging machine; 8, air-introduced machine; 9, spray cooling device; 10, exhaust gas processing device.
Detailed description of the invention
As shown in Figure 1, the Segmented heating of organic polluted soil of the present invention, the structural representation of modularization thermal desorption equipment are made up of screening plant, feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, the complete treatment system of tail gas, heat-exchange system, control system; Described feeding conveying system is connected with low temperature drying system, and low temperature drying system is connected with high-temperature hot desorption system with exhaust treatment system, and described high-temperature hot desorption system is connected with discharging induction system; Described feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, heat-exchange system and exhaust treatment system are all connected with control system, and monitor whole processing procedure by control system.
As shown in Fig. 2 to Figure 10, the course of work of the present invention is:
1. realized dirty native preliminary fragmentation and screening by the band tooth roller bearing bottom screening plant 1.Has a row to be with tooth roller bearing 1-1 bottom this screening plant, the quantity 1-2 of roller bearing can be regulated according to actual conditions, and each band tooth roller bearing is all direct by hydraulic-driven, and do not need to carry out three-shaft linkage by the chain of complexity and sprocket wheel, power and maintainability better.
2. the diameter under sieve is less than the dirt soil of 5cm, is delivered to the charging aperture 3-2 of hollow screw feed arrangement 3 by bucket elevator 2.
3. dirty soil is delivered in the charging aperture 4-1 of low temp dryer 4 by discharging opening 3-4 by power set 3-1 and spiral conveying blade 3-3 by hollow screw feed arrangement 3.
4. the air inlet 3-7 of hollow screw feed arrangement is connected with the air outlet 3-6 of hollow screw drawing mechanism, and carry out indirect heat exchange by the air in air-introduced machine 8 extraction pipe, in the pipeline of hollow screw conveying device, air does not contact with dirt soil, not containing pollutant, after heat exchange, be disposed in ambient atmosphere by the air outlet 3-7 of hollow screw feed arrangement.
5. the heat smoke that the burner 5-1 of high temperature rotary kiln 5 generates is connected with the gas approach 4-2 of dryer 4 by exhanst gas outlet 5-2, for soil dirty in dryer 4 is carried out preliminarily dried, again by inclination angle and the rotary power unit 4-3 control rotating speed of low temp dryer, dryer 4 inwall is also provided with the lifting blade 4-6 of steel construction, two lifting blades are directly in 30 degree of arrangements, effectively instead can throw dirty soil, prevent the sticky wall of dirty soil.Dirt soil after oven dry is delivered in the charging aperture 5-3 of high temperature rotary kiln 5 by discharging opening 4-4.
6. high temperature rotary kiln 5 regulates the temperature of kiln body inside by burner 6, and regulates the rotating speed of self to control the time of staying of dirty soil by rotating control assembly 5-4.
7. high temperature rotary kiln 5 inside is provided with the castable 5-5 that thickness is about 20cm, arranges heat-insulation layer 5-6 to prevent the loss of heat at outer wall simultaneously.
8. hollow screw drawing mechanism 7 is connected with spray cooling device 9, can continuous discharge clean soil after cooling processing, prevents airborne dust simultaneously.
9. by being arranged on hollow screw feed arrangement 3 side air-introduced machine 8, hollow screw feed arrangement 3 and hollow screw drawing mechanism 7 being connected, carrying out exchange heat by the hollow structure 3-5 of inside, the dirty soil of preheating, saves energy consumption.
10. the flue gas that low temp dryer 3 is discharged is collected by the complete exhaust gas processing device 10 be connected with its afterbody and is processed.
11. flue gases, by after the equipment clean process such as the cyclone dust collectors 10-1 in complete exhaust gas processing device 10, demist reaction tower 10-2, ion purifier 10-3, plasma purification equipment 10-4, scrubbing tower 10-6, discharge eventually through chimney 10-7.
The present invention is further illustrated below by way of concrete case study on implementation.
Chemical pollution place, Jiangsu, in place, major pollutants are polycyclic aromatic hydrocarbon (PAHs), and wherein the concentration of benzo (a) pyrene, indeno (1,2,3-cd) pyrene is respectively 0.13-8.6mg/kg, 0.11-3.01mg/kg, and soil moisture content is 40%.
The present invention is made up of screening plant, feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, the complete treatment system of tail gas, heat-exchange system, control system; Described feeding conveying system is connected with low temperature drying system, and low temperature drying system is connected with high-temperature hot desorption system with exhaust treatment system, and described high-temperature hot desorption system is connected with discharging induction system; Described feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, heat-exchange system and exhaust treatment system are all connected with control system, and monitor whole processing procedure by control system.
Contaminated soil carries out sieving through screening plant 1 and after broken pretreatment, soil particle diameter is less than 5cm, enters low temp dryer 4 by bucket elevator 2 and hollow feed spiral device 3.Both hollow feed auger bucket elevators are by Electric Machine Control transmission speed, and motor is connected with control system.
Low temp dryer 4 is roller dryer, has better sealing, and its axis and ground are 5-10 degree angle, is positioned on steel support, by its rotating speed of Electric Machine Control.Internal temperature is 80 ~ 100 DEG C, regulates the time of staying by controlling rotating speed, and the lifting blade 4-6 of inside turns over the dirty soil of throwing, guarantees the dirt soil moisture content <25% after processing.Dirt soil after process enters high temperature rotary kiln by exporting with low temp dryer the high temperature rotary kiln charging aperture 5-3 that 4-4 is connected.
High temperature rotary kiln 5 is drum-type rotary kiln, has better sealing, and its axis and ground are 5-10 degree angle, is positioned on steel support, by its rotating speed of Electric Machine Control.Have the fire-resistant pouring material 5-5 that 20cm is thick in high temperature rotary kiln 5, outside parcel insulation material 5-6 prevents thermal loss.
Burner 6 adopts 0# light diesel as fuel, diesel oil, after burner 6 is lighted, at combustion chamber Thorough combustion, heats the air in Heat Room, hot-air in Heat Room is heated the dirty soil in inside to high temperature rotary kiln 5 by Cemented filling, and dirty soil need stop 30 minutes under the environment of 500 DEG C.The opening degree of burner 6 is controlled by control system.
Heat smoke directly contacts with contaminated soil in high temperature rotary kiln 5, polyaromatic hydrocarbon pollutant in contaminated soil is made to volatilize or separate, the low temp dryer 4 air inlet 4-2 connected with it is entered through air outlet 5-2, in order to heat the dirt soil in low temp dryer 4, make dirty soil dehydration, and reducing flue-gas temperature, the flue gas after cooling enters exhaust gas processing device 10 by the air outlet 4-5 be connected with exhaust treatment system 10, and exhaust gas volumn is 8992m
3/ h.
Dirt soil after high temperature rotary kiln 5 reparation enters hollow discharging screw 7 by discharging opening 5-2, the air inlet 3-7 of hollow screw feed arrangement is connected with the air outlet 3-6 of hollow screw drawing mechanism, and carry out indirect heat exchange by the air in air-introduced machine 8 extraction pipe, in the pipeline of hollow screw conveying device, air does not contact with dirt soil, not containing pollutant, after heat exchange, be disposed in ambient atmosphere by the air outlet 3-7 of hollow screw feed arrangement, heat exchange utilizes air quantity for 6858.9m
3/ h.
Flue gas, by after the equipment clean process such as the cyclone dust collectors 10-1 in complete exhaust gas processing device 10, demist reaction tower 10-2, ion purifier 10-3, plasma purification equipment 10-4, scrubbing tower 10-6, discharges eventually through chimney 10-7.
Complete equipment floor space is 20m*10m, about needs, 200m
2.
Treating capacity is 8-10t/h, low temp dryer operating temperature is 80-100 DEG C, high temperature rotary kiln operating temperature is 500 DEG C, the time of staying is 30 minutes, consume diesel oil and be about 312.5kg/h, relative to the half of electrothermal desorption equipment (6000-8000KW/h) operating cost of same treating capacity.
The detection limit of the equal <0.1mg/kg of concentration of benzo (a) pyrene, indeno (1,2,3-cd) pyrene in dirt soil after process, the removal effect of soil pollutant all reaches more than 99.8%.
Claims (15)
1. Segmented heating, the modularization thermal desorption equipment of a renovation of organic pollution soil, it is characterized in that, be made up of screening plant, feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, the complete treatment system of tail gas, heat-exchange system, control system; Described feeding conveying system is connected with low temperature drying system, and low temperature drying system is connected with high-temperature hot desorption system with exhaust treatment system, and described high-temperature hot desorption system is connected with discharging induction system; Described feeding conveying system, low temperature drying system, high-temperature hot desorption system, discharging induction system, heat-exchange system and exhaust treatment system are all connected with control system, and monitor whole processing procedure by control system.
2. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, be provided with band tooth roller bearing in the bucket of described screening plant, the screening bucket of different tooth pitch or empty bucket can be changed according to the feature of process soil.
3. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described feeding conveying system comprises belt conveyor and hollow screw conveyer, and before belt conveyor is positioned at hollow screw charger, belt conveyor is positioned at aforementioned screening plant bottom.
4. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, the low temperature drying system of described Segmented heating device comprises dryer and short distance conveying worm, after being positioned at the hollow screw conveyer of aforementioned feeding conveying system, and be connected with high-temperature hot desorption system, well-regulated lifting blade and chain are laid in dryer inside.
5. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, the high-temperature hot desorption system of described Segmented heating device comprises rotary kiln and bumer of light fuel, bumer of light fuel is placed in the kiln hood position of rotary kiln, rotary kiln inwall has castable, outer wall parcel heat-barrier material.
6. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, dryer and the rotary kiln of high-temperature hot desorption system of described low temperature drying system are the parallel modes of emplacements that head and the tail are corresponding, and the discharging opening of dryer is a little more than the charging aperture of rotary kiln.
7. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, is characterized in that, described rotary kiln adopts and directly heats, and bumer of light fuel starts, and rotary kiln in-furnace temperature reaches 500 ~ 800 DEG C.
8. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described low temperature drying system carries out drying and dewatering process to contaminated soil, soil moisture content after dehydration is down to about 25%, and the contaminated soil after dehydration enters high-temperature hot desorption system again and carries out thermal desorption process.
9. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, the high-temperature flue gas that described low temperature drying system adopts high-temperature hot desorption system to produce is dried, high-temperature flue gas is at descent of temperature to 110 DEG C, and the afterbody of low temperature drying system connects exhaust gas processing device and carries out absorption process to tail gas.
10. Segmented heating, the modularization thermal desorption equipment of a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described discharging induction system comprises hollow screw conveyer and spray cooling device.
Segmented heating, the modularization thermal desorption equipment of 11. a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described exhaust treatment system comprises venturi cyclone dust collectors; Dynamic wave dedusting demist reaction tower, high-speed ion clarifier, air floatation machine, plasma purification equipment, scrubbing tower.
Segmented heating, the modularization thermal desorption equipment of 12. a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described thermal source exchange system comprises air-introduced machine, air-introduced machine is arranged on aforementioned feeding spiral conveyer afterbody, and charging conveyor screw machine has pipeline to be connected with the hollow structure in discharging spiral conveyor.
Segmented heating, the modularization thermal desorption equipment of 13. a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, described heat-exchange system passes through the hollow screw machine of air-introduced machine and aforementioned discharging induction system, the heat that high temperature contaminated soil in discharge system is carried by the air transfer of the hollow pipeline in conveying worm to feeding conveying system, and the contaminated soil after preheating screening.
Segmented heating, the modularization thermal desorption equipment of 14. a kind of renovation of organic pollution soil according to claim 1, it is characterized in that, air in the hollow pipeline of the hollow screw machine of described discharging induction system does not directly contact with dirt soil, not containing pollutant, after heat exchange, directly drain into ambient atmosphere by air-introduced machine.
The Segmented heating of 15. 1 kinds of renovation of organic pollution soil, modularization thermal desorption method, contaminated soil is screened out foreign matter through screening plant, enter low temp. drier through soil conveyer again and tentatively remove moisture in soil, by the high-temperature hot desorption apparatus that contaminated soil is delivered to by the inclination angle and rotating speed that control drying unit, the heat smoke direct contact heat transfer that dirty soil produces with burner in high-temperature hot desorption system, organic pollution is evaporated, soil after purification serves as backfill soil, dirt soil and purification soil are carried out heat exchange by the hollow screw conveying device simultaneously by being equipped with air-introduced machine, the high-temperature flue gas that thermal desorption device produces is sent into drying unit by pipeline and is carried out preliminary hydro-extraction and hyperthermic treatment to soil, and tail gas is through the pipeline input exhaust treatment system of air-introduced machine through dryer afterbody.
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